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PUBMED FOR HANDHELDS

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  • Title: Local heat effect on sympathetic skin responses after pain of electrical stimulus.
    Author: On AY, Colakoglu Z, Hepguler S, Aksit R.
    Journal: Arch Phys Med Rehabil; 1997 Nov; 78(11):1196-9. PubMed ID: 9365348.
    Abstract:
    OBJECTIVE: To investigate the analgesic effort of local superficial heating by studying sympathetic skin responses. DESIGN: Randomized trial. SETTING: Electromyography laboratory in the department of physical therapy and rehabilitation of a university hospital. SUBJECTS: Twenty healthy volunteers participated with informed consent. INTERVENTIONS: Sympathetic skin response (SSR) amplitudes following electrical stimulation of the right peroneal nerve and skin temperatures in both hands were recorded simultaneously. All of the recordings were repeated at 5-minute intervals during local heat application over the right palm and within 15 minutes after heat application was stopped. RESULTS: SSR amplitudes in both hands decreased significantly during local heating (p < .05) and did not return to their initial levels within 15 minutes of the recovery period; the reductions remained statistically significant (p < .05). Amplitude reductions were statistically more significant on the heated hand compared with those on the contralateral hand (p < .05). CONCLUSION: Therapeutic local heat application reduces the sudomotor response to a painful stimulus. This analgesic effect may be due to suppression of cortical pain sensation resulting from increased levels of endorphins, and may also be a result of local inhibition of both afferent and efferent C fibres.
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